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An Introduction to Medicinal Chemistry

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186 <strong>An</strong>tibacterial agents<br />

= CH 3<br />

C0 2Me<br />

C0 2 Me<br />

- ttX I<br />

3<br />

C0 2 Me<br />

Fig. 10.48 Synthesis of 3-methylated cephalosporins.<br />

synthesis, which was first demonstrated by Eli Lilly, involves a ring expansion, where<br />

the five-membered thiazolidine ring in penicillin is converted <strong>to</strong> the six-membered<br />

dihydrothiazine ring

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